[PATCH v2 0/5] mmc: sdhci: a few fixes on timeout and max_discard_to

[Shawn Guo]

On Tue, Dec 17, 2013 at 04:16:26PM +0800, Dong Aisheng wrote:
> Patch 1~4 mainly fixes the issue that the max timeout counter for uSDHC is
> 1 << 28 rather than 1 << 27. 1~2 fix getting the max timeout counter
> while 3~4 fix setting the max timeout.
> Thus it introduces two new platform hook: get_max_timeout_count and set_timeout
> for those platform which have different timeout setting.
> 
> This issue is firstly reported here by Ed Sutter:
> http://www.spinics.net/lists/linux-mmc/msg23375.html
> The root cause is the max_discard_to got from uSDHC is too small, only 677ms,
> which cause the max_discard_bytes for eMMC is only 512, then the discard operation
> of mkfs.ext3 for an eMMC card is too slow, just like dead.
> With above patches, the issue can be fixed.

It seems the series got lost?  The issue reported by Ed Sutter is still
there with the latest kernel.

Dong, you may need to rebase it a little bit and resend.

Shawn

> 
> Patch 5 adds the capability to calcalute the max_discard_to dynamically
> for SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK.
> 
> Originally the max_discard_to for a high speed sdhc card may be:
> mmc1: new high speed SDHC card at address aaaa
> mmc1: calculated max. discard sectors 49152 for timeout 1355 ms
> After fix:
> mmc1: new high speed SDHC card at address aaaa
> mmc1: calculated max. discard sectors 712704 for timeout 5422 ms
> 
> It also improves the card discard performance a lot due to max_discard_sectors
> increase a lot.
> 
> There's also discussion about remove max_discard_to limit here:
> http://www.spinics.net/lists/linux-mmc/msg23395.html
> But it does not help for uSDHC since we can observe data timeout
> on a Toshiba SD3.0 cards if we do not disable data timeout interrupt.
> 
> ChangeLog:
> v1->v2:
>  1. change .get_max_timeout to .get_max_timeout_count to reuse some code
>  2. some other minor changes based on Shawn's comment.
>  3. patch 6 in v1 is dropped since not need anymore after change 1
> 
> 
> 
> Dong Aisheng (5):
>   mmc: sdhci: add platfrom get_max_timeout_count hook
>   mmc: sdhci-esdhc-imx: fix incorrect max_discard_to for uSDHC
>   mmc: sdhci: add platform set_timeout hook
>   mmc: sdhci-esdhc-imx: set the correct max timeout value for uSDHC
>   mmc: sdhci: calculate max_discard_to dynamically for
>     SDHCI_QUIRK_DATA_TIMEOUT_USES_SDCLK
> 
>  drivers/mmc/host/sdhci-esdhc-imx.c |   20 +++++++++++
>  drivers/mmc/host/sdhci.c           |   66 +++++++++++++++++++++++------------
>  drivers/mmc/host/sdhci.h           |    3 ++
>  3 files changed, 66 insertions(+), 23 deletions(-)
> 
> -- 
> 1.7.2.rc3
> 
> 
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